Use the geometric to compute annual portfolio returns

Compute a trimmed mean

How do the various measures of central tendency
compare with each other? For symmetric
distributions, the mean, median, trimean, and trimmed mean
are equal, as is the mode except in bimodal
distributions. Differences among the measures occur with skewed
distributions.

With a positively skewed distribution, the mean is
typically higher than the median and
the trimean
and trimmed
mean will fall between them. The geometric
mean is usually lower than all measures except the mode.